Team
Dr. Danielle Oncer, PharmD
Pharmacist · Co-Founder & Chief Wellness Officer
PharmD, Wegmans School of Pharmacy · Residency, Corpus Christi Medical Center
Danielle is a pharmacist (PharmD) and co-founder of Shroombiosis, where she owns the science: reviewing the research, checking the dosing, and making sure every formula is built with integrity.
She earned her PharmD at the Wegmans School of Pharmacy at St. John Fisher University, and did a residency at Corpus Christi Medical Center. Her practice has spanned clinical pharmacy and compounding.
The compounding matters more than it sounds. Compounding is formulation work: you build a preparation to a specification, and you are accountable for exactly what ends up in it and at what strength. That is the same discipline behind every dose printed on our label, and it is why "we'll just add a bit of everything" was never going to fly here.
Her training in pharmacology and pharmacokinetics is exactly what functional-mushroom content usually lacks — a clear-eyed look at what a compound actually does, at what dose, and whether your body can absorb it in the first place. She's the bylined author of most of the Shroombiosis journal, and she reviews every health claim on this site before it publishes.
Outside work, she's happiest with yoga, the outdoors, and animals.
In the press
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Stop Mixing These 2 OTC Medications, Pharmacists Say (opens in new tab)
Quoted as one of the pharmacists on over-the-counter medication safety.
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Pharmacists Warn GLP-1 Users To Watch Their Timing With This Other Common Medication (opens in new tab)
Quoted on the timing of GLP-1 medications alongside other prescriptions. Syndicated by AOL.
Articles by Danielle Oncer
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Do Probiotics or Fiber Raise Your Own GLP-1?
Your gut makes GLP-1 on its own, and fiber and bacteria can nudge it. A pharmacist walks through what has actually been measured in people, at what doses, and where the evidence runs out.
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What Is a Tri-Biotic? How to Tell a Real One From the Word
Tri-biotic means prebiotic, probiotic and postbiotic in one product. Nobody regulates the term, so here are the three checks that separate a real one from a label.
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How to Spot a Fake Supplement Expert (Including the AI Ones)
Hundreds of AI-generated 'doctors' are selling supplements online. A pharmacist's five checks for verifying an expert is real before you take the advice.
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Best Time to Take Mushroom Supplements
The best time to take mushroom supplements is the time you'll actually keep. What matters more than timing, when caffeine forces your hand, and whether hot coffee ruins it.
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Reishi vs Lion's Mane: Which One Do You Actually Want?
Reishi vs lion's mane: they do different jobs. What the human research shows for each, what it doesn't, whether you can take them together, and how to choose.
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Can You Take Mushroom Supplements Every Day?
Yes — and for most of what these ingredients do, daily is the point. Here's why consistency matters more than dose size, whether you need to cycle off, and who should check first.
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Are Mushroom Supplements FDA Approved?
No — and neither is any other supplement. Here's how dietary supplements are actually regulated, what the FDA does and doesn't check, and what that means when you're choosing one.
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Reishi and Immune Balance: More Than Calm
Reishi is famous for calm — but it's also a beta-glucan-rich immune mushroom. Here's the human evidence for how reishi supports healthy immune function.
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Your Gut and Your Immune System: The Real Connection
A large part of your immune system sits around your gut. Here's how a well-fed microbiome — fiber, biotics, and mushroom beta-glucans — supports healthy immune function.
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What Are Beta-Glucans in Mushrooms? The Key Active
Beta-glucans are the cross-mushroom active behind immune support. Here's what they are, why the extract quality matters, and why labels should disclose them.
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Reishi for Calm and Restful Evenings: An Honest Look
Reishi for calm, restful evenings: a caffeine-free wind-down ritual built on a real 500 mg reishi dose — framed honestly, not as a sleep aid.
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Which Mushrooms Actually Support Immunity?
A pharmacist on mushrooms for immune support: how beta-glucans engage immune-cell receptors, and what's actually studied for turkey tail, chaga, and reishi.
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Mushroom Supplements and Medications: A Pharmacist’s Answer
A pharmacist on mushroom supplements and prescription medication: what we know, the honest gaps in the interaction research, and exactly what to ask before you start.
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Lion's Mane for Focus and Memory: What the Evidence Supports
What human studies show about lion's mane for focus, memory, and clarity — kept honest and separate from the animal NGF research, at a real dose.
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How to Quit Caffeine Without the Crash: A Gentle Taper Plan
How to quit caffeine without crashing: a pharmacist explains why cold turkey causes withdrawal headaches and a 2–3 week taper that keeps you steady.
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How Much Lion's Mane Per Day? A Transparent Dosing Guide
How much lion's mane per day? The studied range is ~1,000–3,000 mg of fruiting-body powder. A pharmacist on dose, timing, consistency, and underdosing.
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Functional Mushrooms for Women: Calm, Energy & Gut Comfort
Functional mushrooms for women's wellness, explained by a pharmacist — reishi calm, lion's mane and cordyceps for energy and focus, and gut comfort.
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Women's Energy and the Gut-Brain Connection
Women's energy and gut health link through the gut-brain axis. A pharmacist explains how a balanced gut supports steady, caffeine-free energy.
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Why the Coffee Crash Happens (and How to Skip It)
What causes a coffee crash? A pharmacist explains the adenosine rebound and blood-sugar dip behind it — and how caffeine-free, built energy skips it.
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Do Probiotics Help Women's Health?
Probiotics for women, explained by a pharmacist — what the gut and metabolic research actually shows, and what it honestly doesn't.
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Prebiotics vs. Probiotics vs. Postbiotics, in Plain English
Prebiotics, probiotics, and postbiotics explained simply — what each one is, how they work together, and how to tell them apart on a supplement label.
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Pre, Pro & Postbiotics for Women, Explained
Prebiotics, probiotics, and postbiotics for women explained by a pharmacist — what each one does for gut and metabolic health, with the honest caveats.
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Lion's Mane for Focus at Work: A Calm Look
Lion's mane for focus at work: what the research supports, why it's not a stimulant, and how to fit it into a deep-work day without the crash.
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Gut Health and Your Cycle: A Calm Primer
Gut health and your cycle: a calm, pharmacist-written primer on how the gut microbiome and hormones may interact — honest, structure/function education.
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Fiber for Gut Health: Your Microbiome & Comfort
Fiber for gut health, explained simply: how prebiotic fiber feeds your microbiome to support everyday digestive comfort — and the honest caveats.
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How to Focus While Studying Without Caffeine
How to focus while studying without caffeine: what the research supports — lion's mane, steady blood sugar, and a settled gut. No jitters, no crash.
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Cacao for Mood and Gentle, Caffeine-Free Alertness
Cacao for mood: what the cocoa-flavanol science actually shows, why our cacao is flavor-level, and how it supports a gentle, caffeine-free lift.
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Should You Take a Probiotic? Ask a Pharmacist First
Should you take a probiotic? A pharmacist's calm checklist — pregnancy, medications, conditions, and how to read the label before you start.
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Are Mushrooms Probiotics? Prebiotic vs. Probiotic, Honestly
Are mushrooms probiotics? No. Their beta-glucans act as prebiotics — food for the bacteria you already have. A pharmacist explains the difference.
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Are Functional Mushrooms Safe? A Pharmacist’s Take
Are functional mushrooms safe? A pharmacist's honest take on tolerability, who should check with a professional, and what the research actually shows.
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Lion's Mane Pharmacology: How It Actually Works
A pharmacist explains lion's mane pharmacology: NGF, hericenones vs. erinacines, the clinical dose, and why your gut decides whether it works.
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How Your Gut Microbiome Fuels Real Energy and Focus
Real energy starts in your gut, not your coffee cup. How functional mushrooms and pre/pro/postbiotics work with your microbiome to fuel energy and focus.